A question has been asked: How to make a responsive theme in Zen 5? Modules and procedures to keep or to leave from older Zen versions.
The question is not constructive and should be closed, but the OP has put a bounty on it.
It's way, way too broad and is essentially a shopping list question, neither of which are allowed as per the FAQ.
Where do we go from here? Refund the bounty and close the question? Wait for the bounty to expire and close the question? Ignoring it is not an option in my opinion as the question (while interesting) is definitely not right for Drupal Answers.